字符串与二进制相互转换

字符串转二进制

private static byte[] hex2byte(String str) {
  if (str == null)
   returnnull;
  str = str.trim();
  int len = str.length();
  if (len == 0 || len % 2 ==1)
   returnnull;
  byte[] b = new byte[len /2];
  try {
   for (int i =0; i < str.length(); i += 2) {
    b[i/ 2] = (byte) Integer
      .decode("0X"+ str.substring(i, i + 2)).intValue();
   }
   returnb;
  } catch (Exception e) {
   returnnull;
  }
 }

 

二进制转字符串

private static String byte2hex(byte[] b)
 {
  StringBuffer sb = newStringBuffer();
  String stmp = "";
  for (int n = 0; n <b.length; n++) {
   stmp =Integer.toHexString(b[n] & 0XFF);
   if(stmp.length() == 1) {
    sb.append("0"+ stmp);
   } else{
    sb.append(stmp);
   }
  }
  return sb.toString();
 }